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I am looking at sailing from San Diego through the Panama Canal in December; but would like to know if the seas in the Pacific Ocean are rough at this time of the year. I would appreciate any input as to the best time to sail if they are rough. Thanks.

The answer is you just don't know and it's not because it is December. The seas may be very calm or it could be a little rough and no one can be sure what to expect. I would not hesitate to book the cruise.